Anything anybody tells you about 292s vibrating at high rpm and shaking dampers and flywheels loose is true. Normal weight-balancing is a must, but it's torsional vibration (the long crankshaft twisting back & forth) that makes them come apart. Glen Self told me how he was keeping his race car screwed together back around 1971, but mine slung a rod out the side before I could give it a thorough street-driving test. Sure was fun while it lasted, though.